Millman Lake
Millman Lake in Henderson County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 192 acres.
- Area
- 192 acres
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Why Millman Lake has no grade
We grade a lake only when the monitoring record supports a letter: at least three phosphorus or chlorophyll-a samples in the last ten years, scored against EPA National Lakes Assessment thresholds for this lake’s ecoregion. For Millman Lake, no water-quality sampling on record for this lake.
Not Rated is not an F. It is EPA Integrated Reporting Category 3 — insufficient information. The water here may be excellent or poor; nobody has measured enough of it to say. Everything below that has been measured is still reported on this page.
Sampling is run by Illinois EPA and volunteer programs, and published through the EPA Water Quality Portal. Read the full grading methodology.
Millman Lake is a 192-acre lake in Henderson County, Illinois.
Source: EPA Water Quality Portal sampling records, Illinois EPA, last sampled recent years. Grade methodology: LakeQuality methodology.
Watch Millman Lake water quality
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Swimming Safety
Not ratedElevated nutrients
Not rated for swimming — there is not enough monitoring data to judge this lake
Water quality measurements for Millman Lake
These readings exist but are not enough for an A–F grade — see why.
No clarity data. Trophic State Index: undefined.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | No recent samples | |
| Phosphorus | No recent samples | |
| Chlorophyll-a (Algae) | No recent samples | |
| Trophic State Index (TSI) |
Where to stay near Millman Lake
Compare lakeside cabins, hotels, and vacation rentals near Millman Lake in Henderson County, Illinois — live availability and prices for your trip. Switch the map to Satellite to see the lake and how close each stay is to the water.
Top-rated places to stay near Millman Lake
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Lake Details
| Characteristic | Value |
|---|---|
| Surface Area | 192 acres |
No bathymetric survey has been published for Millman Lake, so its depth is not documented here.
Fishing Millman Lake
Nearby Lakes in Henderson County
Frequently asked questions about Millman Lake
Where is Millman Lake?
- Millman Lake is a lake in Henderson County, Illinois. LakeQuality has not rated this lake (UNRATED) — no water-quality sampling on record for this lake.
What is the water quality grade for Millman Lake?
- Millman Lake in Henderson County, Illinois is not rated for water quality — its monitoring record does not meet the evidence bar. Surface area: 192 acres.
Is Millman Lake safe to swim in?
- Not rated for swimming — there is not enough monitoring data to judge this lake. Millman Lake is not rated for water quality — its monitoring record does not meet the evidence bar. Always check local health department advisories before swimming.
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Where this data comes from
Measurements for Millman Lake come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.